Question

（2005•四川）在函數(shù)y=中，自變量x的取值范圍是    ．

Answer 1

【答案】分析：根據(jù)當(dāng)函數(shù)表達(dá)式是二次根式時(shí)，被開方數(shù)為非負(fù)數(shù)可知x-1≥0，解不等式得x的范圍．
解答：解：根據(jù)題意得：x-1≥0
解得：x≥1．
點(diǎn)評(píng)：規(guī)律總結(jié)：當(dāng)函數(shù)表達(dá)式是二次根式時(shí)，被開方數(shù)為非負(fù)數(shù)．